<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>

<body>
    <div id="demo">

        <!-- 
            数据代理:
                 通过一个对象(obj1)代理对另一个对象(obj2)的属性(b)的操作(读/写)
        -->

    </div>
    <script>
        Vue.config.productionTip = false;

        let obj1 = {a:1};
        let obj2 = {b:2};

        Object.defineProperty(obj1,'b',{
            get(){
                return obj2.b
            },
            set(val){
                obj2.b = val
            }
        })
    </script>
</body>

</html>